I just finished the upgrade mod to the MS3 stock mount. I'd say there are zero drawbacks to this mod, and the improvements are well worth the price. I was concerned that it would increase vibrations at idle, but I feel no difference. The throttle and clutch are much more mechanically involving now than with the mushy stock mount.
'12 SE Sport 5Dr |╠╬╝|SGM|203a|Moonroof|17" Paint/Mach Whls|K&N 57S-4000|FFE RMM|Steeda STB, RSB|JBR bushings
'01 ZX3|╠╬╝|Pitch Blk|Prem pkg|Moonroof|SVT Snorkel|SVT Susp|Steeda STS|Magnaflow exh